Yellow symbiotic star AG Draconis in the scope of the New Online Database of Symbiotic Variables

TL;DR

This paper discusses the activity and unique features of the yellow symbiotic star AG Draconis, highlighting recent outbursts and its inclusion in a new comprehensive database of symbiotic variables.

Contribution

It introduces AG Draconis' recent activity within the context of a new online database of symbiotic stars, emphasizing detailed observational data.

Findings

AG Draconis exhibited four minor outbursts after seven years of quiescence.

The star's activity was studied with unprecedented detail due to collaboration between amateurs and professionals.

AG Draconis is part of a less common group of yellow symbiotic systems with earlier spectral type cool components.

Abstract

Symbiotic stars are strongly interacting binaries, consisting of a white dwarf and a cool giant, mainly of spectral type M. AG Draconis belongs to a less numerous group of the yellow symbiotic systems, as the cool component in this binary is of a spectral type earlier than K4. Recently, after seven years of quiescence, this symbiotic star exhibited a very unusual active stage with the four minor outbursts observed. Thanks to the excellent involvement of amateur astronomers and professional observatories, we can study the activity of AG Draconis in unprecedented details. In the present work, we discuss the activity and peculiarities of this interacting system within the entire group of symbiotic stars whose properties have recently been presented in our New Online Database of Symbiotic Variables.